Telephone-transmitter



(No Model) H. O. ALEXANDER. TELEPHONE TRANSMITTER.

N0.584,618. Patented June 15,1897.

INVENTOR WITNESSES T a A TTORNEYS.

HORACE c. ALEXANDER, or BONl-IAM, TEXAS.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part Of Letters Patent No. 584,618, dated June 15,1897.

Application filed February 27, 1897. Serial No. 625,252. (Nomodeh) 1 T0aZZ whom it may concern:

Beit known that I, HORACE O. ALEXANDER, of Bonham, in the county ofFannin and State of Texas, have invented a new and ImprovedTelephone-Transmitter, of which the following is a full, clear, andexact description.

This invention relates to transmitters for telephones; and the object isto provide a simple transmitter in which the greatest volume of soundmay be transmitted without causing grating or rattling.

I will describe a telephone-transmitter embodying my invention, and thenpoint out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference in dicatecorresponding parts in all the views.

Figure 1 is a sectional elevation of a transmitter embodying myinvention. Fig. 2 is a plan view of an insulating base-block employed.Fig. 3 is a bottom plan view of a diaphragm employed, and Fig. t is anedge view thereof.

In this transmitter the diaphragm l and shell 2 are stamped from asingle piece of metal, and the shell 2 is provided with an an' nularflange having openings for the passage of screws to secure thetransmitter to the telephone-box. The diaphragm 1 is secured to abase-block 3 of insulating material-such, for instance, as wood. Thisblock 3 is provided with a recess 4: in its inner surface to allow forthe vibration of the diaphragm. The block 3 is also provided with acentral opening 5, in which is arranged a carbon block 6, secured to ametal plate 7, attached to the outer surface of the block 3.

The carbon block 6 is provided with a cell 8, into which a carbon nipple9 on the diaphragm extends. The nipple 9 is somewhat smaller in diameterthan the cell 8, and in the space between the wall of the cell and thenipple I place an electrode 10 of granulated material such, forinstance, as powdered carbon. Between the inner end of the carbon block6 and the diaphragm I place a ring of yielding material 1l-such, forinstance, as felt. This yielding material 11 may be secured to thecarbon block by means of a suitable adhesive, and its object is toprevent a rattling or grating between the diaphragm and the carbonblock.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A telephone-transmitter, comprising a diaphragm andshell formed from one piece of metal, a block of insulating material towhich the diaphragm is secured, a carbon block attached to a metal platesecured to the block of insulating material, a vibrating nipple on thediaphragm extended into a cell formed in said carbon block, and anelectrode of granulated material surrounding the nipple in the cell,substantially as specified.

2. A telephonetransmitter, comprising a block of insulating materialhaving a recess formed in its inner surface and having a centralopening, a metal plate secured tothe outer surface of said block, acarbon block secured to the metal plate and extended through saidopening, the said carbon block having a cell formed in it, a diaphragmsecured to the block of insulating material, a carbon nipple on saiddiaphragm and extended into the cell, a granulated electrode surroundingthe nipple in the cell, and a yielding material placed between the innerend of the carbon block and the diaphragm, substantially as specified. Q

HORACE C. ALEXANDER.

WVitnesses:

Ms. B. McKINNnY, B. A. MCKINNEY.

